One Raspberry is connected with a 7inch display. A lot of windows are to big. I found out I can drag them around to reach any part of it by using alt + click.
I use that Pi to DJ (with a midi mixer, hifiberry, usb-soundcard and SDD disk) and the MIXXX program is to big. It's not really handy to move it around the whole time. I searched for smaller skins, but even the smallest is too big.
I found that with xfce4 you can set a custom DPI-setting. Is there another way to scale my desktop in general or mixxx especially?